On Mon, Mar 25, 2019 at 12:33:37PM -0400, Joel Fernandes wrote: > On Mon, Mar 25, 2019 at 11:02 AM Paul E. McKenney <paulmck@xxxxxxxxxxxxx> wrote: > > > > On Fri, Mar 22, 2019 at 11:46:19PM -0400, Joel Fernandes (Google) wrote: > > > The rcutorture jitter.sh script selects a random CPU but does not check > > > if it is offline or online. This leads to taskset errors many times. On > > > my machine, hyper threading is disabled so half the cores are offline > > > causing taskset errors a lot of times. Let us fix this by checking from > > > only the online CPUs on the system. > > > > > > Signed-off-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx> > > > > Good catch! > > > > Please see below for one suggestion for simplification. > > > > Thanx, Paul > > > > > --- > > > tools/testing/selftests/rcutorture/bin/jitter.sh | 11 ++++++++++- > > > 1 file changed, 10 insertions(+), 1 deletion(-) > > > > > > diff --git a/tools/testing/selftests/rcutorture/bin/jitter.sh b/tools/testing/selftests/rcutorture/bin/jitter.sh > > > index 3633828375e3..53bf9d99b5cd 100755 > > > --- a/tools/testing/selftests/rcutorture/bin/jitter.sh > > > +++ b/tools/testing/selftests/rcutorture/bin/jitter.sh > > > @@ -47,10 +47,19 @@ do > > > exit 0; > > > fi > > > > > > - # Set affinity to randomly selected CPU > > > + # Set affinity to randomly selected online CPU > > > cpus=`ls /sys/devices/system/cpu/*/online | > > > > cpus=`grep 1 /sys/devices/system/cpu/*/online | > > Yes, this is better. Lets do it this way :) > > > > sed -e 's,/[^/]*$,,' -e 's/^[^0-9]*//' | > > > grep -v '^0*$'` > > > > Of course, now I have no idea why I excluded CPU 0... :-/ > > Yes, I was wondering as well about that :-) Please feel free to try including CPU 0 and running the set of single-CPU rcutorture scenarios. ;-) Thanx, Paul
